describe('practice-2-9', function () {

    it("舍罕王失算，计算国王总共需要将多少麦子赏赐给宰相", function () {
        var sum_wheat = quantity_of_wheat();
        var sum_wheat_temp = 0;
        for(var i = 0; i < 64; i ++)
        {
            sum_wheat_temp += Math.pow(2,i);
        }
        expect(sum_wheat).toBe(sum_wheat_temp);
    });

});